Joining the Renewable Heating Hub forums is completely free and only takes a minute. By registering you’ll be able to ask questions, join discussions, follow topics you’re interested in, bookmark useful threads and receive notifications when someone replies. Non-registered members also do not have access to our AI features. When choosing your username, please note that it cannot be changed later, so we recommend avoiding brand or product names. Before registering, please take a moment to read the Forum Rules & Terms of Use so we can keep the community helpful, respectful and informative for everyone. Thanks for joining!
Last seen: Aug 24, 2026
Actually, on second thought, it's the actual temperatures which are measured and reported as integers. Given that those do vary, and given that flow ...
Good point. Depending on how good the control loop is the actuals may be a bit noisy, which on average might improve the resolution, but that's clutc...
To reconcile the figures measured at the heat pump it must be measured at the heat pump. Measuring it at the phe (and measuring dt across the phe) wi...
Manufacturers normally specify if figures are net of defrost. Of course if the tests are done in the arizona desert rather than on a small island on...
I assume your figure, like mine, is from flow rate and dt. If so then they are subject to the same errors/factors. It could be flow rate, it could b...
It uses all the one minute data positive and negative except if the diverter is set to dhw.. Energy for defrost comes from the house so should be and...
If I understand the graph correctly the 60min average energy out seems to be around 8kW. Is this right?
Thanks for the data. I have taken this and plotted various adjustments. Here are the key results. Each point is one noon-noon measurement. I ...
yes it has thanks. I was apparently logged in, but I logged out and logged back in and this magically appeared
Clearly its either undersized (which is unusual but possible) or badly set up. Installer needs to take responsibility unless someone else did the cal...
Are you sure that the problem with defrost cycling is not caused by the LLH? Two reasons: 1. The LLH will in all probability reduce the FT to t...
Its unlikely to help unless you have a specific problem which extra system volume is likely to fix (eg short cycling). And if you have got a problem ...
SPONSORS
Degrees of Separation
Latest Posts
-
RE: Volumisers in Heat Pump Systems: Does Placement Matter?
Volumisers are normally plumbed so that they are in the...
By JamesPa , 2 hours ago
-
@toodles possibly. The £9k labour charge for 4-5 days w...
By AndrewJ , 7 hours ago
-
RE: Plug and play solar. Thoughts?
My thought is simple. Bring it on and bring on plug in...
By JamesPa , 11 hours ago
-
RE: Heat Geek mini store vs pump size
Yes I agree, that’s why Heat Geek have most likely sele...
By Tomtheheatingengineer , 1 day ago
-
RE: Who's your electricity provider and what's your tariff?
@chandykris Swings and Roundabouts, you win some…. ...
By Toodles , 1 day ago
-
@tomtheheatingengineer, thank you, and welcome to the f...
By Mars , 1 day ago
-
RE: HeatGeek vs Octopus surveys: puzzling disparity - any ideas why?
@majordennisbloodnok @tomtheheatingengineer For my ...
By JamesPa , 1 day ago
-
RE: Do I add Air Con or MVHR to existing A2W ASHP?
There is scope for product development here. I for one...
By JamesPa , 1 day ago
-
RE: Is the "divide by 2900" rule still valid?
Really flow rate is a pipework limitation not a water p...
By JamesPa , 2 days ago
-
RE: The good, the bad and the not that great – my heat pump installation
@burtis, I’ve followed this thread pretty much from the...
By Mars , 5 days ago
-
RE: Starting Our Heat Pump Journey: 1962 build 3 bed detached house
First time poster here but I can share my experience as...
By SCH , 5 days ago
-
RE: Is it the house or the equipment?
...which, I've found out, is pretty much impossible to ...
By Majordennisbloodnok , 5 days ago
SPONSORS
